Materials for Second and Third Order Nonlinear Optical Applications
Annual rept. 1 Jun 1993-31 May 1994
CALIFORNIA INST OF TECH PASADENA
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We have developed a new synthesis of aldehyde precursors to second and third-order nonlinear optical materials. In this procedure, aldehydes with extended conjugation can be conveniently prepared in one step from organolithium reagents and vinylogous amides. We have also synthesized some donor-acceptor substituted thiophenevinylene oligomers that display enhanced optical nonlinearities and that have been incorporated into poled polymer. Although the compounds had large nonlinearities, insolubility precluded incorporating large amounts of the compounds into the host-guest polymer systems. Finally we have synthesized a series of compounds that have allowed us to map out the behavior of the first hyperpolarizability as a function of ground-state polarization and bond length alternation. The ground-state polarization was monitored by infrared spectroscopy using the local vibrational modes of a functional group on the end of the molecule as a probe.
- Industrial Chemistry and Chemical Processing